Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population

A. What we know about

B. are

C. from spreading

D. among

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.

A. What we know about

B. are

C. from spreading

D. among

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

What we know about (A) certain diseases are (B) still not sufficient to prevent them from spreading (C) easily among (D) the population.

A. What we know 

B. are 

C. from spreading

D. among 

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

What we know about (A) certain diseases are (B) still not sufficient to prevent them from spreading (C) easily among (D) the population.

A. what we know about

B. are

C. from spreading

D. among

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions

(A) What we know about certain diseases (B) are still not sufficient to prevent them (C) from spreading easily (D) among the population

A. What we know about

B. are

C. from

D. among

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Hardly he had graduated from Vietnam Naval Academy when he joined Vietnam Coast Guard.

A. he had    

B. graduated from  

C. when       

D. joined